Reed Canary grass is my favorite dry grass. It's easy to mow and yields a tremendous volume of straw. At this time of year, the seeds have all fallen off, and since it's a dominant monoculture, there aren't many other plants mixed in, so it makes a great seed-free mulch. When harvested in dry weather, it requires no further drying, and you can put it directly in a haystack, or pile it high in your barn or chicken coop for winter bedding.
The big hollow stems are great for keeping air in a compost pile. So after you use it for bedding, the manure and straw mix is very compostable. It doesn't form a dense anaerobic mass (like hay or leaves do), that takes forever to break down.
The video below shows how I mow Reed Canary Grass: